Constructive arrangement in a saw

ABSTRACT

A constructive arrangement in a saw, of the type that comprises a thin laminar portion having a compatible standardized length, a serrated or indented profile being defined on its working edge that configures the cutting blade of the laminar saw itself, the free front free end of said laminar portion being defined by a beveled shape with rounded corners. The back coupling end ( 3 ) of the portion ( 10 ) is comprised of a “V” shaped ( 4 ) axially disposed along the body of the blade ( 10 ), followed by a through-hole ( 5 ) that is centered and aligned with the longitudinal axle of said blade ( 10 ), the through-hole ( 5 ) being disposed equidistant said “V” shaped edge ( 4 ) and small transversal thin tabs ( 6 ) incorporated to the side edge of this laminar portion ( 10 ), in a region immediately in front of the recesses ( 7, 7   a ) provided in the respective upper and lower side edges of the laminar portion ( 10 ), thus configuring a neck that prevents the back universal coupling end ( 3 ) from coupling with the rest of the body ( 1, 2 ) of the sawing blade ( 10 ) itself.

The present utility model is directed to a constructive arrangement in asaw, more specifically a jig type saw, said novel constructivearrangement precisely comprising the saw end that attaches same to therespective machine for actuating or operating the saw.

As is known by those skilled in the art, there are plenty of differenttypes and trademarks of sawing devices in the market, including laminarsaws known as “jig-saws”, characterized by being replaceable parts afterthey are worn out or broken.

Every model or trademark of the existing sawing devices presents adistinct particular attachment system, thus forcing the user to acquirecutting saws provided with their attachment end consistent with thecoupling or fitting system of the device.

Although this condition presents at first a certain protectionism thatfavors the manufacturers of machines by specifying or associating thereplaceable saw with the sawing device, it brings about a number ofinconveniences at a later time, for it also creates an extensivedependence of the machine on the cutting tool.

One of these inconveniences is the fact that in the event there is ashortage of cutting tools in the replacement market, the sawing devicebecomes idle, a situation that causes problems to the user.

Another inconvenience is the fact that the user, when buying the sawingblades, must have in mind the exact type and model of machine he owns inorder to buy the compatible saw, what does not occur all the time.

Another inconvenience of this diversity of models of machines andrespective sawing blades is the fact that the salesman have must keep aspare supply in his store for every model and type of saw, thusrequiring further space and storing cost and investment in goods, withrespect to a good whose rotation cannot be predictable.

Another inconvenience of said diversity of saws is the fact that themanufacturer must keep a regulating supply, a production line andmachinery for producing every type and/or model of sawing blades thatare compatible with the innumerable types and models of the existingsawing devices.

Therefore one of the objects of the present invention is to provide aconstructive arrangement in a saw that eliminates the possibility of ashortage of the cutting in the replacement market and, consequently, itprevents the eventual idleness of the sawing device.

Another object of the present invention is to provide a constructivearrangement in a saw that it does require the user to know precisely thetype and model of machine he owns so that he can buy a type ofcompatible saw.

Another object of the present invention is to provide a constructivearrangement in a saw that does not require the salesman to keep areplacement supply in his store for every model and type of saw.

Another object of the present invention is to provide a constructivearrangement in a saw that does not require the manufacturer to keep: aregulating stock, a line of production and machinery for producing everytype and/or model of sawing blades that are compatible with theinnumerable types and models of sawing devices that the manufacturerhimself sells.

These and other objects and advantages of the present invention areattained by a constructive arrangement in a saw that comprises a thinlaminar portion having a compatible standardized length, a serrated orindented profile that configures the proper wire of cut of the laminarsaw being defined on its working edge, the free front end of saidlaminar portion having a beveled shape with rounded corners, while inaccordance with the present invention the back coupling end of saidportion is provided with a “V” profile axially disposed along the bladebody, followed by a circular through-hole that is centered and alignedwith the axle of said blade, said circular hole being disposedequidistant said “V” axial edge and small rectangular transversal thintabs incorporated to a side edge of said laminar portion, in a regionimmediately in front of a substantially trapezoidal recess provided inthe respective side edges in the laminar portion, thus configuring aneck that prevents the back universal end from coupling with the rest ofthe body of the sawing blade itself.

The present invention will be described below with reference to theaccompanying drawings, in which:

FIG. 1 shows a plan view of the inventive saw arrangement;

FIG. 2 shows a perspective detailed view of the coupling end of the sawaccording to the constructive arrangement shown in FIG. 1;

FIG. 3 shows a partially cut elevation view of the actuating pin of aBosch® type sawing device having the inventive saw coupled thereto;

FIG. 3 a shows an enlarged detailed view of the coupling sleeve of theactuating pin of a Bosch® type sawing device having the inventive sawcoupled thereto;

FIG. 4 shows an elevation view of the actuating pin of a Black & Decker®type sawing device having the inventive saw coupled thereto;

FIG. 4 a shows another elevation view taken 90° to the previous figureshowing in a partially cut view the coupling point of the actuating pinof a Black & Decker® type sawing device having the inventive saw coupledthereto;

FIG. 4 b shows an enlarged detailed view of the coupling sleeve of theactuating pin of the Bosch® type sawing device having the inventive sawcoupled thereto;

FIG. 5 shows a partially cut elevation view of the actuating pin of a DeWalt® type sawing device having the inventive saw coupled thereto;

FIG. 5 a shows an enlarged detailed view of the coupling sleeve of theactuating pin of a De Walt® type sawing device having the inventive sawcoupled thereto;

FIG. 6 shows an elevation view of the actuating pin of a B&D 3157 or DW313 type sawing device having the inventive saw coupled thereto;

FIG. 6 a shows a top view of an enlarged cross-section of the couplingsleeve of the actuating pin of a sawing device taken from arrow “A” ofthe previous figure; and

FIG. 6 b shows a detailed partially cut front elevation view of thecoupling sleeve of the actuating pin of a sawing device taken from arrow“A1” of FIG. 6.

According to these illustrations, the constructive arrangement in a sawobject of the present invention comprises a thin laminar portion 10having a compatible standardized length provided with a serrated workingedge 1 that configures the cutting blade of the laminar saw 10 itself.

As can be seen in the figures, the free front end 2 of said laminarportion 10 is preferably beveled with rounded corners.

On the other hand, the back coupling end 3 of the portion 10 object ofthe present invention has a “V” shaped end edge 4 axially disposed alongthe body of blade 10. As can be seen in FIGS. 1 and 2, more specificallyin this back end of coupling 3, a circular through-hole 5 is providedthat is centered and lined with the longitudinal axle of blade 10; saidcircular through-hole 5 being disposed equidistant said axial end “V”shaped edge and small rectangular transversal thin tabs 6 that areincorporated to the side edge of the back end 3 of the laminar portion10.

Immediately after this pair of tabs 6, the side edges of the couplingend 3 of the portion 10 is provided with a recess 7 having asubstantially rectangular contour on its upper side and a substantiallytrapezoidal contour on its lower side, see FIG. 1, thus configuring aneck that prevents the back universal end 3 from coupling with the restof the body 1 and 2 of the sawing blade 10 itself.

With this configuration of the coupling end 3, illustrated in FIGS. 1and 2, the sawing blade 10 can be connected to any type and model ofsawing device as illustrated in FIGS. 3, 4, 5, 6 and details thereof.

FIGS. the 3 and 3 a show that the inventive sawing blade 10, whencoupled to the actuating pin 11 of a Bosch® type device, has its backend 3 enclosed by the sleeve 12 of actuating pin, thus keeping its endedge 4 supported against a stopping pin 13 that, by means of a spring14, urges the transversal tabs 6 of the universal end 3 against theinner face of the sleeve, thus holding firmly the sawing blade 10 to theactuating pin 11 of the machine. Thus, for this model of machine theelements that interact mechanically in the coupling thereof are: the endedge 4 and the transversal tabs 6 of the back end 3 of the blade 10.

FIGS. 4 and 4 a show that the inventive sawing blade 10, when coupled tothe actuating pin 21 of a lack & Decker® type device, has its back end 3held by the radial mechanical pressure exerted by the sleeve 22 and thelocking bolts 23 that connect the actuating pin 21 and compress thefront and back faces of the coupling end 3, see FIGS. 4, 4 a and 4 b.Thus, the side edges of the coupling end 3 in front of the transversaltabs 6 of the universal end 3 remain compressed from above with thesleeve 22 and the actuating pin 21 while, simultaneously, the front andback faces of said end 3 are timely and alternatively compressed by thelocking bolts 23. Thus, for this model of machine the elements thatinteract mechanically in the coupling is the peripheral contact of theuniversal end 3 portion between the end edge 4 and the side edges infront of the transversal tabs 6 of the back end 3 of the blade 10.

FIGS. 5 and 5 a show that the present sawing blade 10, when coupled tothe actuating pin 31 of a De Walt® type device, has its back end 3 heldby the radial mechanical pressure on the conical bifid jaw 32 providedin inside the end of the sleeve 33. Thus, when axially and radiallycompressed by the jaw 32, the actuating pin 31 holds in its end thefront and back faces and the side edges of the coupling end 3, providedin front of the transversal tabs 6 of the universal end 3. Thus, forthis model of machine the elements that interact mechanically in thecoupling also are the peripheral contact of the universal end 3 portionbetween the end edge 4 and the side edges in front of the transversaltabs 6 of the back end 3 of the blade 10.

Finally, FIGS. 6, 6 a and 6 b show that the inventive sawing blade 10,when coupled to the actuating pin 41 of a B&D 3157 or DW 313 typedevice, has its back end 3 enclosed by the sleeve 42 that is attached bya locking bolt 43 to the actuating pin 41. The coupling end 3 of theblade 10 is still held in the actuating pin 41 by a second locking bolt44 that crosses the threads of the sleeve 42, the free end thereofaxially incorporating a cylindrical portion 45 that is fit into thethrough-hole 5 of the coupling end 3 of the blade 10 attaching same tothe end of the actuating pin 41. This way, for this model of machine theelements that interact mechanically in the coupling are the peripheralcontact of the universal end 3 portion and the through-hole 5 of theblade 10.

Although a preferred constructive configuration has been described andillustrated, it should be pointed out that changes can be made andapplied without departing from the scope of the present invention.

1-4. (canceled)
 5. A saw blade comprising a thin cutting portion, a topedge, a bottom edge and a longitudinal axis equidistant from said topand bottom edge, a coupling end, said coupling end having a V-shapededge centered on said longitudinal axis, a first tab on said top edge, asecond tab on said bottom edge, a first recess next to said first tab, asecond recess next to said second tab, and a through hole between saidcoupling end and said tabs.
 6. The saw blade of claim 5, wherein saidthrough hole is centered on said longitudinal axis.
 7. The saw blade ofclaim 5, wherein said through hole is centered between said coupling andsaid tabs.
 8. The saw blade of claim 6, wherein said through hole iscentered between said coupling and said tabs.
 9. The saw blade of claim5,wherein said tabs are rectangular.
 10. The saw blade of claim 5,wherein said first recess is rectangular and said second recess istrapezoidal.
 11. The saw blade of claim 5, wherein said through hole iscircular.